Maintain control of your Microsoft Office 365 email data
tomhkr
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Re: Select mailboxes takes long time

Post by tomhkr » Oct 19, 2016 1:45 pm 1 person likes this post

I have applied the experimental fix and tried creating a new backup job.
It is significantly faster, it now took "only" 11 minutes to arrive to mailbox selection.

It would still be a very welcomed feature to be able to select mailboxes with some criteria, like aforementioned group or list membership, custom attributes et.c. , to search for and browser through tens of thousands of mailboxes to find 15 of them is cumbersome.

Regarding performance on running backup job, the read rate from Office 365 appears to be about 1.2-1.5 Mbyte/s
This is quite low, considering large organizations. But I beliieve this is due to rate limiting at Microsoft, cannot blame Veeam for the low transfer rate. I did a few mass migrations to Office 365 and they all exhibited the same speeds.

foggy
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Re: Select mailboxes takes long time

Post by foggy » Oct 19, 2016 3:17 pm

tomhkr wrote:Regarding performance on running backup job, the read rate from Office 365 appears to be about 1.2-1.5 Mbyte/s
With the purpose of getting some stats, what is the total number of mailboxes and what was the entire job duration/repository size?

tomhkr
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Re: Select mailboxes takes long time

Post by tomhkr » Oct 20, 2016 6:17 am 1 person likes this post

I did a test backup with only 2 mailboxes from the IT department since I know some of them contains some meat.

Here are the stats:

First full backup:
xxxx.onmicrosoft.com; 2016-10-19 15:55; 19 minutes, 26 seconds; Items: 37866 (1,59 GB); Processing rate: 32 items/s (1,40 MB/s)

Incremental 8 hours later:
xxxx.onmicrosoft.com; 2016-10-20 00:01; 1 minute, 40 seconds; Items: 16 (642,66 KB); Processing rate: 0 items/s (6,39 KB/s)

Please let me know if I can run more test jobs.

Btw just for kicks I did
(Get-Mailbox -ResultSize Unlimited).Count
59279

:shock:
I did not measure it accurately but I believe it took about 10-15 minutes. So the issue with listing mailboxes at large tenants is probably a limit with Office 365. This would make it even more interesting to get the ability to filter on properties.

Mike Resseler
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Re: Select mailboxes takes long time

Post by Mike Resseler » Oct 20, 2016 9:20 am

Hi Tom,

Interesting what you did. So just using PS fron your workstation (I assume?) you did a simple count to verify how much mailboxes there are in your environment and it took that long to get the results? Did I understand that correctly?

Mike

tomhkr
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Re: Select mailboxes takes long time

Post by tomhkr » Oct 20, 2016 11:29 am

Yes that's correct.
It takes huge amounts of time, cpu and memory to list all mailboxes in a large tenant like this.
The local Powershell-process bloats to about 7 GB used RAM while fetching the boxes.
I ran it again, this time measuring properly.

Measure-Command {(Get-Mailbox -ResultSize Unlimited).Count}
Days : 0
Hours : 0
Minutes : 27
Seconds : 16
Milliseconds : 657

Almost 30 minutes.

Mike Resseler
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Re: Select mailboxes takes long time

Post by Mike Resseler » Oct 20, 2016 12:06 pm

Tom,

Thanks for doing this! We really appreciate it. It learns us a lot

Brgds,

Mike

tomhkr
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Re: Select mailboxes takes long time

Post by tomhkr » Oct 20, 2016 12:29 pm 1 person likes this post

Send a PM if you need additional tests done, I'm not at the forum daily.

foggy
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Re: Select mailboxes takes long time

Post by foggy » Oct 24, 2016 3:33 pm

The fix for this and several other issues reported for Veeam Backup for Office 365 beta 1 is available here.

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